Fig. 3: The enantioselective synthesis of helicoid Pt NPs. | Nature Communications

Fig. 3: The enantioselective synthesis of helicoid Pt NPs.

From: Enantioselective synthesis of chiroplasmonic helicoidal nanoparticles by nanoconfinement in chiral dielectric shells

Fig. 3

a Schematic illustration for the synthesis of helicoid Pt NPs. The green and translucent models represent the Pt-based NPs and chiral SiO2 nanoshells, respectively. b–e TEM images of (b) Au@Pt@chiral SiO2 NPs, (c) Pd seeds@chiral SiO2 NPs, (d) L-helicoid Pt@SiO2 NPs, and (e) L-helicoid Pt NPs. f, g SEM images of (f) L- and (g) D-helicoid Pt NPs. h The g-factor and normalized extinction spectra of L- (dark green) and D-helicoid Pt NPs (violet). i–p Theoretical calculation of the intensity difference distribution of local electric fields (ΔE = ERCP-ELCP) on (i) L- and (m) D-helicoid Pt NPs irradiated by circularly polarized light from the [100] direction, with the color map from blue (−2.0) to red (2.0). SEM images of individual (j–l) L- and (n–p) D-helicoid Pt NPs viewed from the (j, n) [100], (k, o) [111], and (l, p) [110] axes. q, r (q) TEM image of a single helicoid Pt NP and (r) the corresponding SAED pattern taken over the entire NP. s HRTEM image of the edge-on surface on the helicoid Pt NP corresponding to the red box in (q). t EDX elemental mapping of Pt (green) from a single helicoid Pt NP. The inset show the corresponding HAADF-STEM image. Scale bars: b–g 200 nm. i–p 100 nm. q 50 nm. r 5 nm−1. s 5 nm. t 100 nm. Source data are provided as a Source Data file.

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